Lamp-socket.



0. KUPFERMAN.

LAMP SOCKET.

APPLICATION FILED MAY l. 19418A 1 .301 ,457. Patenmd Apr. 22,1919.

+3 2 SHEETS-SHEET l.

IZ?. 4 l?. '5

O. KUFFERMAN.

LAMP SOCKET.

APPLICATION FILED MAY I. 1918.

l ,301 ,4:57.v Patented Apr. 22, 1910.

2 SHEETS-SHEET 2.

OSCAR KUPFERMAN, OF BROOKLYN, NEW YORK.

LAMP-SOCKET.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application liled May 1, 1918. Serial No. 231,839.

To all whom 1f/may concern.'

Be it known that I, OSCAR KUPFERMAN. a citizen of the United States of America, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and v useful Improvements in Lamp-Sockets, of which the following is a specification.

The present invention relates to lamp sockets of the class which are commonly known as "pull sockets in which the lamp circuit is made and broken by a rotating contact piece actuated by a chain.

One of the principal objects of my invention is to provide a socket of stronger construction than those hitherto available both against damage by the tools and manipulation and the more or less rough treatment to which sockets are frequently subjected vwhen assembled and also against downward pulling strains.

A second object of my invention is to provide a lamp socket which is simpler and easier to construct than those hitherto used and particularly easier to assemble into operative relation or disassemble when the circuit connections are being made, changed or inspected.

A third object of this invention is to provide a very simple and comparatively inexpensive construction.

With these and other objects in View my invention consists in the construction of a socket in which the parts of the switch operating mechanism are entirely separated from those of the switch proper.

Myvinvention also consists in the particular construction, combination and arrangement of parts as will be hereinafter more fully described and set forth in the appended claims. y

In the accompanying drawing which forms part of this specification and in which similar reference characters denote corresponding parts, Figure 1 is an elevation of the socket; Fig. 2 is a. section through line 2 2 of Fig. 1; Fig. 3 Vis an elevation of the insulating block or body in which the switch proper and the parts for actuating the same are mounted; Fig. 4 is a side elevation thereof; Fig. 5 is a similar elevation as that of Fig. l but at a right angle thereto; Fig. 6 is a top view of the insulating block or body; Fig. 7 is a bottom view of the same; Fig. 8 is a partial elevation of the lower section of the shell inclosing the insulating block; Fig. 9 is the trumpet shaped guide for the pull chain; Fig. 10 is an enlarged section on line 10-10 of Fig. 3; Fig. 11 is a detail part of the switch operating mechanism; Fig. 12 is a side view thereof; Fig. 13 is a rear view of the chain pulley; Fig. 13at is a front view of the square; Fig. 14 is an elevation of another detail thereof; Fig. 15 is a front view of another detail; Fig. 16 is a section on line 16-16 of Fig. 15; Fig. 17 is a plan view of the mechanism forming the switch proper; Fig. 18 is a section on line 18-18 thereof; Fig. 19 is an elevation of the switch proper and Fig. 20 is a section on line 20-20 of Fig. 19.

The insulating block generally of porcelain, is made of a single piece 1 which, by a vertical partition 2, is divided into two separate chambers 7 and 8. The partition is centrally perforated as at 3 and at one side is provided with a circular shoulder et arranged concentrically with. the perforation 3 and on thev opposite side with a similar shoulder 5 of larger diameter. On the side of the shoulders is provided a groove 6 of circular shape and concentric with the said shoulder and perforation, said groove forming a bearing for a base plate constituting a part of the switch operating mechanism to be hereinafter described. The chamber 7 is adapted to' contain the different parts of the switch operating mechanism which, as will be seen, are entirely separate from the switch proper. The latter is contained in the compartment 8 formed on the opposite side of the partition 2 in the insulating body. Fixed to the bottom of the insulating body is the usual threaded shell 9 into which the glass bulb of the incandescent lamp is adapted to be screwed. Rotatively borne in the perforation 3 of the insulating body is a spindle or pin 10 which; at one end is of square cross section as at 10. This square portion of the spindle extends partly into the chamber 7 and partly into the chamber 8.

The switch operating mechanism contained in the chamber 7 is composed of a number of easily separable parts all mounted on one another. There is first a base 11 in form of a circular disk provided centrally with a square hole 11 which is adapted to snugly engage the square 10 of the spindle 10. In diameter this base is so admeasured that it iits into the circular groove 6 which is formed concentrically with the shoulder 4. This base, on its rear, has a fiat even surface wherewith it rests against the even front face of the shoulder 4 and on its opposite face is provided with two circularly curved marginal cam surfaces 12 and 13. These cam surfaces 12 and 13 extend from diametrically opposite points 12, 13 in the same direction, gradually decreasing in height until they become even with the face of the disk at points 122, 132 opposite the elevated points 12, 13. Being mounted on the square 10" of the spindle, it will, when rotation is imparted thereto, transmit rotary motion to the spindle and consequently to the switch to be hereinafter described. Loosely mounted on the cylindrical portion of the spindle 10 is a resilient member 14 made of steel or the like which is in the form of a circular plate 15 provided with two oppositely projecting lingers 16, 17 and a central circular perforation 15. This member isl curved so that when in assembled position its inner face will be concaved as shown in Fig. 10 and the digits or fingers 16, 17 will abut against the cor# responding elevated points 12, 13 of the cam disk. The perforation 15 of this member is large enough to permit it to turn freely on the cylindrical portion of the spindle 10. Resting against the outer convexed face of the resilient member 14 is a hollow pulley shaped member 1S which is open at one side and on the outer face of its opposite side is provided with two oppositely directed circularly curved flanges 19 between the opposite ends of which free spaces 19 are forme-d of a width about equal to the width of the fingers 16 and 17 so that the pulley in operative position will engage these lingers in the spaces 19 between the flanges 19 thereof, and when rotatedaround its axis carry along the member 14. The

`pulley 18 is provided with a hub portion 20 extending through the hollow thereof and with which it rotatively bears on the cylindrical part of the spindle 10. A ring shaped member 21 is mounted to loosely and flatly bear on the inner face of thefrear side as shown in Fig. 10. This ring 21 is provided with a circumferential'projection 22 formed with a marginal upstanding edge 23. This projection 22 is adapted to project outwardly from the hollow of the pulley through a circumferential recess 18 provided in the pulley as shown in Fig. 13a. The upstanding edge 23 is provided with a substantially keyhole shaped hole 23', 232 which opens to the outside and which serves for the attachment of the chain 24 as will be hereinafter described. Mounted within the .hollow of the pulley `and around the hub portion thereof is a spiral spring 25, the inner end of which is adapted to be hooked to the pulley, by engaging it with one of the edges of the recess 18 thereof (Fig. 13a) while the outer end thereof engages ay stationary member 26 (Figs. 3 and 10). The latter is a strip of metal having a centrally perforated disk shaped portion 26 (Fig. 3), to engage the outer end of the cylindrical part of the spindle, and diametrically opposed-arms 262 bent inwardly at their free ends to engage grooves 1 provided inthe top and bottom of the insulating body as shown in Fig. 10. The disk shaped portion is provided with a cut out part 263 for the engagement of the outer end o-f the spring 25.

When this member 26 is mounted in position, the spindle 10 projects outwardly thro-ugh the central perforation thereof. On its threaded end 102 of the spindle, a nut 27 is applied to tighten the assembled parts in position. The chain 24 which, as usual, is composed of a number of beads or balls strung on a piece of wire, is connected to the mechanism by inserting the end ball thereof into the circular opening 2i of the edge 23 of the member 21 through the slot 232 thereof.

It will be seen that when the chain is pulled, the nose 22 which fits in the recess 18V of the pulley will engage the latter and against the tension of the spiral spring revolve it around its. central axis. By this rotation of the pulley, the member 14, the fingers' 16, 17 .of which are engaged in the spaces 19. between the flanges 19 of the pulley will be carried along. The fingers lying in contact with the face of the disk 11 and in the path of the cam surfaces 12,13 will, in one direction of rotation of the pulley engage the elevationsv 12 .13 like teeth of a ratchet wheel and impart rotation to the disk 11 which, in its turn, as stated before, will impart rotation to the spindle 10 and consequently to the switch mounted thereon. VThe rotary movement of the pulley is limited by a stop 12 against which the nose 22 of the member 21 will strike, when the pulley is turned by the pulling of the chain (Fig. 3). When the chain is released, thc compressed spiral will reverse the direction of rotation of the pulley which again will carry along with it the member 14 and the fingers 16,17 thereof will now ride up the inclines of the cam shaped Hanges 12, 13 from the points 122, 132 thereof without moving the disk 11. Thus a repeated pull on the chain will result in the rotation of the disk 11 in one and the same direction.

I shall now describe the switch mechanism itself.

Fixed in the compartment 8 to the insulating body 1 are an upper Contact piece 28 and a lower contact piece 29. The upper contact piece has a. part 28 (Fig. 2) which projects into the compartment 8 and extends through the path of the switch proper 31. The outwardlyprojecting point of the contact piece 28 carries the terminal screw 32 for the electric wire 33. Thelower contact piece 29 is conductively connected to the metal screw shell 9 and also lies in the path of the rotary switch 31.

The latter is in form of an arc or segment 32 of Conductive material secured to or made integral with a ring 33 having a neck 33, (Figs. 19 and 20). The circular opening in the ring is of such diameter thatit will be free from Contact with the spindle around which it is mounted. The same is carried by a wheel shaped body 34 of insulating material provided with a central square opening 34 and on one face with a marginal rim 342 which forms a socket for said ring 33 (Figs. 17, 18). The rim at one place is interrupted to form a passage 343 for the neck 33 of the switch body 31 and whereby the latter is held against rotation. The segment shaped portion 32 is adapted to engage around the circumfer- \ence of the wheel 34 (Fig. 10). The wheel 34 is engaged with'its square opening 34 by the square portion 10 of the spindle 10 and is thereby keyed or fixed to the spindle so as to revolve with the latter. The spindle, at the outer end of the square portion 10, is provided with a head 102 so that when the wheel is mounted on the spindle it abuts against the head and is thereby prevented from falling off. The annular' shoulder 5 of the partition wall 3 which projects into the chamber 8 is adapted to fit into the groove or space formed by the iiange 342 of the wheel and to rest against the hub portion 33 of the switch when the parts are assembled so as to prevent the switch from a displacement longitudinally of the spindle. It will be seen that the switch on one side rests against the insulating material of the wheel and on the other side against the insulating material of the body 1 and has no connection at all with the metal parts of the mechanism. The segment is so admeasured that in a certain position it will bring about a contact between the two Contact pieces 28, 29 in the chamber 8.

The chain which is, as heretofore described, attached with one end to the member 21 mounted within the hollow of the pulley is guided through the trumpet shaped nozzle 35 and is provided on its rear with a plate 36. The shell which incloses the insulating body is, as usually, composed of upper and lower sections 37, 38 adapted to telescope over one another and which, by the usual coupling means, are adapted to be coupled together. The upper and lower sections are each provided with cut out portions 37 38', adapted to engage around the neck of the trumpet while the elongated upper and lower parts of the plate 36 will engage the inner faces of the said sections above andv below the margins of the cut out portions. When the two sections are coupled, the trumpet will be locked in position.

'The second terminal screw 39 to which is attached the electric wire 40 is carried by a metal strip 41 which extends vertically over the insulating body 1 on the side where the switch is mounted. The lower end 41 of this strip is bent at a right angle and passed into the hollow of the shell 9 through a recess 9 thereof to form a resilient' contact tongue with which the metal part of the bulb (not shown) when screwed into the shell will become conductively connected. The opposite end 412 of the strip is secured to the dome or upper part of the insulating body by a screw 42 or the like.

The chief advantage of my invention resides in the separation of the switch operating mechanism from the switch proper, so that by no possible means can a short circuit occur.

Another advantage lies in the fact that all parts of the mechanism are so mounted that they can be easily taken apart on un screwing of a single nut, to wit nut 27, whereby any delay in assembling or disassembling the parts will be eliminated.

Furthermore injury to the mechanism can be cured by replacing the new part.

The insulating body being made of one piece of porcelain, jerks caused by pulling of the chain will not affect the socket. Since various modifications may be made 1n the construction of my socket without departing from the spirit of my invention, I do not limit myself to the details described and shown.

What I claim and desire to secure by Letters Patent is:

1. In a. pull socket, a rotary switch member, a switch operating mechanism comprising rotary base having cam surfaces, a resilient finger removably mounted thereon and adapted to coperate with said cam surfaces, a spring controlled chain operated hollow pulley removably engaging said spring finger, a common spindle for said rotary base and said switch, said switch being insulated from said spindle and a removable member in said pulley for the attachment of the chain, said last named member being coupled to said pulley to impart rotation thereto.

2. In a pull socket, a rotary switch member, a switch operating mechanism comprising a rotary base having cam surfaces, a spring controlled hollow and recessed pulley, a resilient member removably engaged by said pulley and adapted to coperate with said cam surfaces, ysaid switch member being insulated from said switch operating mechanism and a member removably mounted within said hollow pulley and having a part projecting outwardly through the recess thereof for the attachment of a chain to operate said pulley.

3. In a switch operating mechanism for pull sockets or the like, the combination with a spindle, of a motion transmitting device consisting of a chain operated pulley having on one of its faces oppositely arranged flanges, a spring member loosely engaging between said anges and a member keyed to said spindle and having cam surfaces with which said spring is adapted to cooperate to transmit motion from sai-d pulley to said spindle.

4l. In a switch operating mechanism for pull sockets or the like, the combination with a spindle, of a chain operated pulley loosely mounted on said spindle and having on one of its faces oppositely arranged flanges, a spring member loosely mounted on said spindle and engaging between. said flanges and a member keyed to said spindle and having cam surfaces with which said spring member cooperates to transmit motion from said pulley to said spindle, said cam surfaces extending from diametrically opposed points and arranged so as to gradually decrease in height until they become even with the face of the member carrying the same.

5. In a switch operating mechanism for pull sockets or the like, the combination with a spindle, of a pulley for transmitting motion to said spindle, said pulley being hollow and having a circumferential recess, and a member loosely mounted in the hollow of said pulley and having an extension projecting outwardlyA through said recess and serving for the attachment of a chain for the'mani'pulation of said pulley.

`6. In a switch operating mechanism for pull sockets or the like, the combination with a spindle, of a pulley loosely mounted on said spindle, a member keyed tosaid spindle and having cam surfaces, a spring member loosely engaged by said pulley and cooperating with said cam surfaces, said pulley having a circumferential recess and a ring shapedmember loosely mounted in the hollow of said pulley and having an extension projecting through said recess and serving for the attachment of a chain for the manipulation of said pulley.

7. In a switch operating mechanism for pull sockets or the like, the combination with a spindle, of a motion transmitting device consisting of a member fixed to said spindle and having cam surfaces, a hollow pulley loosely mounted on said spindle, means between saidhollow pulley and said member adapted to cooperate with said cam surfaces and said pulley to transmit motion" from the latter to said spindle, said pulley having a circumferential recess, a ring member loosely mounted within said pulley and having an extension to project through said recess, said projection having an upstanding slotted portion for the engagement of a cha-in serving for the manipulation of said pulley.

8. In a pull socket or the like, the combination with contact pieces and a spindle, of a rotary switch adapted t0 cooperate with said contact pieces and consisting of a ring formed with a projecting arc of conductive material and a hollow wheel shaped body of insulating material fixed to said spindle and in which said ring is loosely mounted, said wheel having a recess through which said arc shaped portion projects outwardly.

9, In a pull socket or the like, the combination with contact pieces and a spindle, of a rotary switch adapted to cooperate with said contact pieces and consisting of a ring formed with a projecting arc of conductive material, a hollow wheel shaped body of insulating material fixed to said spindle and in which said ring is loosely mounted, said wheel having a recess through which said arc shaped portion projects outwardly and means for transmitting motion to said spindle. i

In testimony whereof I allix my signature in presence of tw'o witnesses.

OSCAR KUPFERMAN.

Witnesses:

MAX D. ORDMANN, ELsm SCHMID,

Copies of this patent may he obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

